Neither could I find Oberżyński which is more Polish in form.
You are probably referring to some surname database in Poland. A simple Google search shows about 400 references to "Oberżyński" name plus several references to "Oberżyńska", with this exact spelling.
With all due respect to the eggplant fruit, a.k.a. "aubergine", which gave raise to Polish "oberżyna", there is another French word - "
auberge". It stands for an inn, hostel or public house in English, and to "
oberża", "karczma", "gospoda" in Polish.
The word "oberża" could therefore be an origin of a surname
Oberżyński in Polish. If a person was a Jew, and if he was in "oberża" business (Many, if not the most, inns in the former Polish Lithuanian Commonwealth were run by Jews), this is very likely that he was given the name "Oberżyński" - at the times when Jews were obliged to accept surnames. Mind you - I am just speculating here.
Anyone with such family name who landed in America, would have to do something with "z with dot" and "n with acute", leading to simplified name "Oberzynski". Why "Ober" was then replaced by "Auber" is anyone guess: possibly some pronunciation issues, or bad associations with German-based jokes - as in "Mister Ober Zynski = Mister Upper Zynski". And the last cleanup would involve replacement of "y" by "i", for whatever reason. So this entire process would not be just a "shortening of the name" but its serious modification.
Here is some additional advice on searching Auberzinski = Oberzynski = Oberżyński names. Assuming that this is indeed a Jewish name you may proceed as follows.
Step 1. Go to
AVOTAYNU, Consolidated Jewish Surname Index, avotaynu.com/csi/csi-home.htm
Enter Surname to be Searched: OBERZYNSKI
In response you will get a list of names, somewhat sounding like OBERZYNSKI, but only one exact match, with SOUNDEX 074645, and only one database pointer: A.
At the bottom of that page there is a list of all available databases and one of them is: A.
A. Jewish Records Indexing - Poland , jewishgen.org/jri-pl/jriplweb.htm
(231,973 surnames). An index to over 2,400,000 Jewish birth, marriage, divorce and death records located in the archives of Poland. An on-going project--continuously updated. Online database
Step 2. So go there and continue your search.
I ran a quick search there on the Surname (is Exactly) OBERZYNSKI. I had no other information to add.
Two lists were returned: one from Kalisz Gubernia, and one from Piotrkow Gubernia (Gubernia = Russian for Province, more or less).
Kalisz Gubernia: A record for Nachman Puter 1847, Father Jakob, Mother Drejza, Mother's surname
OBERZYNSKI .
Piotrkow Gubernia: A record for Gdala Oberzynski 1861, male, no other details
There are many other options you can choose from for various names: (is Exactly, Sounds Like, Phonetically like, etc.) You can also provide many more parameters, like the first name, town name, province, etc.
I repeated Step 1, but this time with the name AUBERZINSKI. And guess what? The response was somewhat similar as in the first search, with the sound like names ABERZANSKY and OBERZYNSKI to be the closest to the input name. So OBERZYNSKI seems to be quite a strong guess. But there are seven other names worthy to check. I'll leave the rest to you, of course.